Jean v



I. v. Glas 5a.

COOLING SYSTEM FOR INTERN L COMBUSTION ENGINES. APPL'ICATION'FLED NOV. 22. |917.

1,318,069. Panmd oct. 7,1919.

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J. V. GIESLER.

COOLING SYSTEM FOR INTERNAL COMBUSTION ENGINES. APPLICATION FILED Novrzz. |911.

1',318,069. l Patented Oct. 1919.

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Qwuenoz T. 45ML UNITED sTATEs PATENT OFFICE.

JEAN v. GIESLEEQ, QOEKNOXVILLE, TENNESSEE,` AssIGNOET'O THE FULTON GOMPANY, or KNoxvILLE, TENNESSEE, A CORPORATION or MAINE.

To all whom t may concern.'

Be it known that I, JEAN V. GIESLER, a citizen of the United Statesof America, and a residentof Knoxville, Tennessee, have inventedy a new and useful Improvement in Cooling Systems for Internal-Combustion Engines, which invention is ofully set forth in the following specilication.

This invention relatesto cooling systems for internal combustion engines, and while capable of application to a wide variety of engines of this type, has particular utility when applied to the cooling of an automobile engine. O

It is an object of this invention to provide a-cooling system for internal combustion engines with improved mechanism whereby the passage of vair through the radiator andthe flow of cooling medium through the system may be controlled to the end that the engine may operate under the most efficient temperature conditions.k

A. further object of this invention is to.

provide a cooling system for internal combustion engines having a radiator` and a bypass therearound with improved mechanism for controlling the flow of cooling medium through the; radiator and by-pass and the ,passage of air through the radiator.

urther lobject of this invention is to provide a cooling system for internal combustion engines, comprising mechanism for controlling the iiow of cooling medium through the system and mechanism for controlling the passage y of airV throughy the radiator, with improved means whereby said mechanisms may be operated in succession by a common actuating device.

Another object of this invention is to rovide a cooling system for internal com ustion engines, comprising means for controlling the flow. of cooling medium lthrough the system and means yforrontrolling the passage of air .through the radiator, with improved mechanism for Operating said air" controlling means whereby relatively great power may be developed and an. extended range -of movement of said air-controlling means made possible. l

Another object of this inventionl isA to provide a cooling system for internal combustion engines, comprising mechanism for controlling the flow of cooling medium through the system and mechanism for conv Specication of Letters Patent.

COOLING SYSTEM roE'INTERNAE-COMBUSTION ENGINES.

* Patented oct-v, 1919.

Application filed November 22, 1917. y Serial No. 203,362.

trolling the passage of air through the radiator, with thermosensitive means for actuof a cooling system of the'type characterized which is simple in construction, linexpensive to manufacture and install, and-'eilicient in operation.J

Other objects will appear as the descripytion ofthe invention proceeds.

Stated broadly, the invention comprises a coo1ing system for internal combustion engines lincluding. a radiator, a valve for controlling the flow of cooling medium through said radiator, means for controlling the pasrsage'of air through said radiator, an auxiliary system for circulating a fluid, and means in the form of a pressure motor operated by the pressure developed in said circulating system for operating saidv air-controlling means. In the form shown, said system is provided with a by-pass around said radiator and a valve` for closing said by-pass simultaneously with `and proportionately to the opening'of the valve controlling theolowof coolingfmedium through the radiator. To regulate 'the pressure transmitted to the pressure motor, a valve isfprovided in said auxiliarycirculating system and a common actuating means is provided for all said valves, saidy actuating means being shown as a thermosensitive device.` lTo enable the valve inthe .auxiliary circulating system to regulate the pressure transmitted to the pressure motor after the valve mechanism'controlling the flow of the cooling. medium through the radiatorand by-pass has operated, said valve mechanism, inthe form shown, comprisesa v'movable valve seat for coaction with the valve member controlling the flow of cooling medium through the by-pass, whereby, although said valve member is in engagementv with `said valve seat and the passage through said bypass closed, the .valve in said auxiliary. circulating system may continue tomove to regulate the-pressure developed in said ,system and thereby effect the operation of ysaid air-controlling means.

The invention is capable of receiving va variety of mechanical expressions, one of which 1s shown on the accompanying drawings, but 1t is to be expressly understood lthat said drawings are for purposes of illustration only and are not to be con'- strued as a definition of the limits of the invention, reference being had to the appended claims for that purpose.

Referring in detail to said drawings, wherein the same characters of reference designate corresponding parts in the several figures,-'

Figure 1 is a schematic elevation, partly in section, of so much of a cooling system of an internal combustion engine embodying the present invention as is necessary to an understanding of the same;

Figs. 2 and 34 are fragmentary views illustrating different positions assumed by the valves.

In the form shown, 1 is a radiator of any suitable construction, 2 the upper'water line leadingA from the engine jacket or jackets (not shown) to said radiator., and 3 the lower water line leading from said radiator to the circulating pump 4C which communicates through conduit 5 with said jacket or jackets.

lvleans are provided for controlling the passage of air through said radiator, said means being of any suitable construction. In the form Shown, a plurality of shutters 6 are pivotally mounted within a housing 'i' designed to be received over the frontof the radiator, said shutters 6 being pivotally connected to a common actuating bar or rod 8. It will be understood, however, that in place of shutters, a damper, curtain or any other suitable device for controlling the passage of air through the radiator may be employed in place of the shutters shown.

In the form shown, a by-pass is provided around the radiator 1, said by-pass comprising a conduit 9 communicating at its upper end with the upper water line 2 and at its lower end with a thermostat housing 10 provided with a transverse conduit therethrough as shown at 11-12, which conduit is connected into and constitutes a part of the lower water line Conduit 9 may desirably be heat-insulated' so that the water` flowing into the thermostat housing therethrough shall have substantially the same temperature as that at which it leaves the engine jacket or `iackets and flows through the upper water line 2.

Thermostat housing 10 is shown as divided into two chambers by a transverse partition 18, the upper chamber 14 being of such size and conformation as to receive the thermostat to be hereinafter described and provide space between the periphery of said thermostat and the wall of the chamber for the proper circulation of the water. The lower chamber constitutes the transverse Y stat takes the form of an expansible andcontractible corrugated resilient vessel 20 provided with a stationary end wall 21 ixedly mounted in position by any suitable means,

as by a screw-threaded boss 22 received within an aperture in a bracket 23 positioned within said chamber, the opposite and movable end wall 2-1 of said vessel being provided with a valve stem 25 connected to a pair of seating valves 26 and 27 adaptedV to open and close the ports 15 and 1G respectively. Vessel 20 is preferably charged with a volatile thermosensitive fluid at a pressure below that to which said vessel exteriorly subjected, whereby said vessel is normally contracted against the elasticity inherent 'in the resilient walls of the vessel. It is apparent, however, that in place of a vessel constructed with resilient walls, a vessel hailing non-resilient walls but provided With an exterior or interior spring to give the requisite resiliency could be substitut-ed therefor. l

To operate the shutters, a pressure motor is providedin an auxiliary fluid-circulating system. Said system may take a variety of forms and employ any suitable iiuid, and may, under some circumstances, be a s vstem with which an automobile engine is normally provided, such for example as the system for circulating lubricating oil. In the embodiment illustrated, however, this circulating system is made adjunctive to the coolingr system and the cooling medium is the fluid vcirculated therethrough. In the form shown, a pipe 28 communicates with the interior of thermostat chamber 1-1 at one end and with a suitable circulating` pump 29 at its opposite end. Said pump may be driven by a. separate motor but` as shown. is preferably driven from? the driving shaft of pump 4. A second-pipe 30 communicates at one end with the pump 29 and at its opposite end with one branch of a T-coupling 31. F rom the opposite branch of said T-coupling 31 a pipe 32 leads to the interior of a cylinder 33 in which works a piston 3i provided with a. cup-leather packing 35. Piston rod 36 is connected through bellcrank V3?' with the operating bar 8 of the shutteis 6. l'n. the form shown` a. spring 3S is connected to said bell-crank 37 and to a suitable adjusting screw 39 mounted in the llt wall of the shutter housing 7, said spring normally opposing the opening of the shutters. The third branch of said T-coupling 31 communicates through pipe 40 and port 41 with the interior o-f an extension 42 of the thermostat housing, which extension is in open communication with section 12 of the transverse conduit through said housing. To controlsaid port 41, a Valve member 43 is mounted upon or formed integrally with valve stem 25.

Operationz When the engine is started, the cooling medium in the 'cooling system is at a relatively low temperature, vessel 20 is contracted, its movabley end wall 24 is removed from movable valve seat 18, Valve members 26 and27 are `in engagement with valve ports 15 and 16 respectively, and valve member 43 is remote from valve port 41, all as shown in Fig. 3. In this'position of the parts, the pump 4 forces the cooling medium through conduit 5, the engine jacket or jackets, the upper Water line 2, by-pass 9,' thermostat chamber 14, conduit 12, and lower water line 3. As valve members 26'and 27 are in engagement with their respective seats, no cooling medium is flowing through the radiator. Pump 29 also draws cooling medium from thermostat cha1nberf14 through Cpipe 28 and forces the same through pipe 30, T-coupling 31, pipe 40, to extension 42 of the thermostat housing, where it returns to the cooling system through `conduit 12. Spring 38 maintains the shutters 6 closed and piston 3 4 is at the inner end of the cylinder, the flow of cooling medium through the auxiliary circulating system having no effect upon said piston.

As the engine continues to run, the cooling medium rapidly rises in temperature as said medium -is subjected to substantially no cooling iniuence. When the cooling medium reaches that temperature at -which the engine operates most eiiciently and tends to rise above said temperature, vessel 2O begins to expand, its end wall 24 approaching valve seat 18 and valve members 26 and 27 being withdrawn from. valve seats 15 and 1-6 respectively; Part 4of the cooling medium now Hows through the radiator 1 and back to the pump 4 through the sections 11 and 12 of the transverse conduit in the thermostat housing. Since movable end wall 24 of vessel.20 approaches valve seat 18 as valve members /26 and 27 are withdrawn from their respective seats 15 and 16, the flow 'lo-f cooling medium through the 'by-pass is reduced in proportion to the increase of the ow of cooling medium through the radiator. Danger of overheating of the engine, owing to a large quantity of fluid at high temperature flowing. through an alwaysopen by-pass,` is thereby prevented. Opening of the valve ports 15 and 16Vis accom'- panied by movement of valve member 43 toward port 41, butsaid valve member does not approach said port suficiently to reduce -the effective area of the opening, whereby such movement has no effec-t upon the pressure in the auxiliary circulating system in communication with the pressure motor. If thetemperature of the cooling medium continues to rise, vessel 20 continues to expand until its movable end wall 24 engages valve seat 18 cutting olf the flow of cooling medium therethrough and opening wide the ports 15 and 16. In this position of the parts, all ofthe cooling medium is forced through the radiator. If the temperature ofthe cooling medium continues to rise, vessel 2O continues to expand', valve seat 18 moving against the tentension of spring 38 to openpthe shutters 6 and permit the passage of air through said radiator to further cool the medium flowing therethrough. The extent of opening of said shutters depends o n the extent of pressure built up in said circulatingy system,

which pressure in turn depends upon the proximity of valve member 43 to port 41 as determined by the degree of expansion of vessel 20.

Upon a drop in temperature of the cooling medium, a reverse sequence of operations occurs, the shutters rst closing and the valve members 26 and 27 subsequently preventing thev circulation of cooling medium through the radiator.

It will be observed that, by opposing the opening of the shutters with va spring and restricting vthe valve opening in the auxil-l iary system in communication with ,the 115 pressure motorronly after the valve members have operated to entirely close the bypass and open .wide the. passage through the radiator, all of the cooling mediumv is forced to flow through the radiator before the shutters begin to open to admit air to.l

said radiator. Thereby such medium is sub-I jected to the greater cooling iniuence of the radiator before the shutters lare operated, and this additional cooling influence may, in cold weather, be sufficient to maintain said medium at that Atemperature at which the engine operates most efliciently. In case-such additional cooling influence is notV suiiicient, however, thel shutters are 13o opened promptly to such an extent 'and to admit so much air as will maintain the cooling medium at its proper temperature. Furthermore, by proportionately decreasing the low of cooling medium through the by-pass as the flow of cooling mediuln through the radiator is increased, no large quantity of cooling medium at a high temperature is flowing through an always-open by-pass to maintain the temperature of s uch medium as it flows through the jackets at too high a temperature, nor is the effective area through the system so varied by opening up the passage through the radiator as to adversely affect the operation of the circulating pump. By connecting the auxiliary circulating system with the interior of the thermostat chamber 14, it will also be observed that, evenwhen vessel 20 has eX- panded so as to close the port in valve seat 18, there is still a circulation of the cooling medium through the thermostat chamber at a temperature substantially that at which it leaves the engine jacket whereby said thermostat will respond promptly to a drop in temperature.. Furthermore, by ythe use of the piston 34, a relatively long throw is permitted to the member which operates the shutters, which is available not only to open the shutters wide but may be usedfor operating air-controlling devices such as dampers or curtains which require a relatively long movement of their operating members.

Vhile the embodiment of the invention shown on the drawings has been described with considerable particularity, it is to be expressly understood that the invention is not to be restricted thereto, since the same is capable of receiving a variety of mechanical expressions some of which 'will readily suggest themselves to those skilled in the art, while certain features thereof are capable of use without other featuresv thereof. Reference is therefore to be had to the claims hereto appended for a delinition of the limits of the invention.

That is claimed is l. In a cooling system for internal come bustion engines, a radiator, means for controlling the passage of air through said radiator, a valve for controlling the flow of cooling medium through said radiator, an auxiliary system for circulating a fluid, and means controlled by the pressure in said auxiliary circulating system for operating said air-controlling means.

2. In a cooling system for internal combustion engines, a radiator, means for controlling the passage of air through said radiator, a valve for controlling the flow of cooling medium through' said radiator, an auxiliary system for circulating a fluid, means controlled by the pressure in said auxiliary circulating system for operating said air-controlling means, and means for regulating the pressure in said auxiliary circulating system.

3. In a cooling system for internal combustion engines, a radiator, means for con trolling the passage of air through said radiator, a valve for controlling the flow of cooling medium through said radiator, a system for circulating a fluid, means controlled by the pressure in said circulating system for operating said air-controlling means, means for regulatingl the pressure in said circulating system, and a common ao tuating means for said valve and said pressure-regulating means.

4. In a cooling system for internal combustion engines, a radiator, means for controlling the passage of air through said radiator, a valve for controlling the flow of cooling medium through said radiator, a

'system for circulating a fluid, means con trolled the pressure in said circulating system for operating said air-controlling means, means for' regulating the pressure in said circulating system, and a thermosensitive device for operating said valve and said pressure-regu]ating means.

5. In a cooling system for internal combustion engines, a radiator, means for controlling the passage of air therethrough.l a Iby-pass around said radiator, valve mechanism for controlling the fiow of cooling medium through said radiator and by-pass, a system for circulating a fluid, means controlled bythe pressure in said circulating system for operating said air-controlling means, and means for regulating the pressure in sa-id system.

6. -In a cooling system for internal combustion engines, a radiator, means for controlling the passage of air therethrough, a by-pass around said radiator, valve mechanism for controlling the flow of cooling medium through said radiator and bypass, a system for circulating a fluid, means controlled by the. pressure in said circulating system for opera-ting' said air-controlling means, means for regulating the pressure in said circulating system, and a common actuating means for said valve mechanism and said pressure-regu]ating means.

7. In a cooling system for internal com` bustion engines, a radiator, means for controlling the passage of air therethrough, a by-pass.around said radiator, valve mecha-- nism for controlling the flow of cooling medium throughy said radiator and )by-pass, a system for circulating a fluid, means controlled by the pressure in said circulating system for operating said air-controlling means, means for regulating the pressure in said circulating system, and a thermosensi* tive device for operating said valve mechanism and said pressure-regulating means. 8. In a cooling system for..internal comllll 9. In a cooling system for internal comhustion engines, a radiator, means forco-n-` trolling the passage of air-therethrough, a pressure motor forv operating said means, a system for circulating a iuid in operative relation to said pressure motor, a valve in said circulating system, a by-pass around said radiator, valve mechanism for control,-

Vling the iioW of cooling medium through said radiator and b-y-pass, and thermosensitive means for operating said valves.

10.. In a cooling system for internal com- Tbustion engines, a radiator, means for controlling the passage of air therethrough, a pressure motor for operating said means, a

Isystem for circulating a fluid in operative relation to said pressure motor, ajvalve in said circulating'system, a valve for controlling the iioW of cooling medium through said radiator, and thermosensitive means connected to said valves to operate the same in succession. I 11. In a cooling system for internal combustion engines, a radiator, means for controlling the passage of air therethrough, a

pressure motor for operating said means, `a

v system for circulating a fluid i-n operative relation to said pressure motor, a valve in said circulating system, a by-p'ass around said radiator, valve mechanism for controllinglthe'iiow Vof cooling medium through said radiator and icy-pass, and thermosensitive means connected to said valves to operate the same in succession. Y 12. In a cooling system for internal cornbustion engines, a radiator, means for controlling the passage of air therethrough, a valve for controlling the flow of; cooling medium through said radiator, a system for circulating auid, means controlled by the pressure in said circulating system for operating said air-controlling means, means for regulating the pressure in said circulating system, and means connected to said' valve and pressure-regulating means to cause the operation ofthe same in succession.d

13. In a cooling system for internal combustion engines, a radiator, means' for controlling the passage of air therethrough, a valve for controlling the flow of cooling medium through said radiator, a system for circulating a fluid, means controlled by the pressure inv said system for operating said air-controlling means, means for lregulating the pressure in said circulating system, and a ,thermosensitive device connected to said `valve= and 'said pressure-regulating means to cause the operation of the same in succession.

14. In a cooling system for internal combustion engines, a radiator,A4 means for controlling the passage of air therethrough, a

valve for controlling the flow of cooling medium through said radiator, a pressure motor for operating said air-controlling means, a system for `circulating a fluid in operative relation to said pressure motor, a valve in said circulating system, and a common actuating means for Operating said, Valves -in succession.

15. In a cooling system for internal combustion engines, a radiator, means for` controlling the passage of air therethrough, a by-pass around said radiator, valve mechanism for controlling the flow of cooling medium through said radiator and by-pass, a system for circulating a fluid, means controlled by the pressure in said system for operating said air-controlling means, means for .regulating the pressure in said circulating system, and means connected to said valve and pressure-regulating means to cause the operation of the same in succession.

16. In a cooling system for internal combustion engines, a radiator, means for controlling the passage of air therethrough, a by-pass around said radiator, Valve mechanism for controlling the flow of cooling medium through said radiator and ley-pass, a system for circulating a fluid, means controlled by the pressurein said system for operating said air-controlling means, means for regulating the pressure in said circulating system, andv a thermosensitive device connected to said valve and pressure-regulating means tocause the operation of the same in succession.

17.; In a cooling system for internal combustion engines, a radiator, means for controlling the passage of air therethrough, al by-pass around said radiator, valve mechanism for controlling the flow of cooling medium through said radiator and ley-pass,

.by-pass around said radiator, valve mechanism for controlling the flow of cooling medium through said radiator land by-pass, a system for circulating a fluid, means, controlled by the pressure in said circulating system for operating said air-controlling means, means for regulating the pressure in Ysaid circulating system, and a common actuating means for operating said valve mechanism to proportionately close said b ypass and open the passage through said radiator and thereafter operating said pressure-regulating means to open said air-controlling means.

19. In a cooling system for internal combustion engines, a radiator, means for controlling the passage of air therethrough, a by-pass around said radiator, valve mechanism for controlling the flow of cooling medium through said radiator and by-pass, a system for circulating a Huid, means controlled by the pressure in said circulating system for operating said air-controlling means, means for regulating the pressure in said circulating system, and thermosensitive means for operating said valve mechanism to proportionately close said by-pass vand open the passage through said radiator and thereafter operating said pressure-regulating means to open said aircontrolling means.

20. In a cooling system for internal combustion engines, a. radiator, means for controlling the passage of air therethrough, a by-pass around said radiator, valve mechanism for controlling the flow of cooling medium through said radiator and by-pass, a pressure motor for operating said air-controlling means, a system for conveying a pressure-fluid to said pressure motor, a valve in said system for controlling the pressure transmitted to said pressure motor, and thermosensitive means for operating said valves in succession.

21. In a cooling system for internal combustion engines, a radiator, means for controlling the passage .of air therethrough, a valve for controlling the How of cooling medium through said radiator, a pressure motor for operating said air-controlling means, a system for circulating a fluid in operative relation to` said pressure motor, va valve in said system for controlling the pressure transmitted to said pressure motor, and thermosensitive means for operating said valves in succession. i

22. In a cooling system for internal combustion engines, a radiator, means for controlling the passage of air therethrough, a pressure motor for operating said means, a valve for regulating the pressure transmitted to said pressure motor, a by-pass around said radiator, salve mechanism for controlling the flow of cooling medium through said radiator and by-pass, and a connection between said valve and said valve mechanism, said valve mechanism including a mov'- able valve seat whereby said valve may regulate the'pressure transmitted to said pressure motor after said valve mechanism has closed said by-pass.

23, In a cooling system for internal com- Ibustion engines, a radiator, means for controlling the passage of air therethrough, a pressure motor for operating said means, a valve for 'regulating the pressure transmitted to said pressure motor, a by-pass around -said radiator, valve mechanism for control- .1mg the flow of cooling medium through said radiator and by-pass, and a thermosensitive deviceconnected to said valve and said valve mechanism for operating the same, said valve mechanism' including a movable valve seat whereby said valve may regulate the Ypressure transmitted to said pressure motor after said valve mechanism has closed said by-pass. i

24. In a cooling system for internal combustion engines, a. radiator, means for controlling the passage of air therethrough, a pressure motor for operating said means, a valve for' regulating the pressure transmitted to said pressure motor, a by-pass around said radiator, connected valves for simultaneously closing said by-pass and opening the passage through said radiator, and thermosensitive valves, said by-pass valve having a movable valve seat whereby after said by-pass is closed said first-named valve may regulate the pressure transmitted to said pressure motor and effect the operation'l of said aircontrolling means.

25. In a cooling system for internal combustion engines, a radiator, means for controlling the passage of air through said radiator, a by-pass around said radiator, a valve to control the flow of cooling medium through said by-pass, said valve having a spring-pressed valve seat, a valve for controlling the flow of cooling medium through said radiator, a pressure motor for operating said air-controlling means, a system for circulating a fluid in operative relation to said pressure motor,a valve in' said circulating system, and a common actuating means for all said valves, said valve seat moving after said by-pass is closed andthe passage through said radiator is open to enable said last-named valve to regulate the degree of pressure transmitted to saidV pressure motor.

26. In a cooling system for internal combustion engines, a radiator, means for oontrolling the passage of air through said radiator, a pressure motor for operating the same, a valve for regulating the pressure 'transmitted to said pressure motor, a bypass around said radiator, valve mechanism for controlling the flow. of cooling medium through said radiatorand by-pass, and means connecting said valve and said Valve mechanism to move in unison, said valve mechanism having a movable valve seat to enable said first-named valve to regulate the transmission of pressure to said pressure motor after said valve mechanism has closed said by-pass and opened the passage through said radiator,

means connected to all said` 27. In a cooling system for internal com- 'bustion engines, a radiator,'means for con-- trolling the passage of air therethrough, a

valve for controlling the flow of cooling medium through'said radiator and. having :a position Vof safety, ating vsaid `air-controlling means, a' system for circulating a fluid in operative relation to said pressure motor, a valve in said system adapted in one position to cause'said .pressure motor to move said air-controlling means to safety position, and thermosensitive vmeans for operating said valves, said thermosensitive means having .an inherent tendency to 'move said valves to their respective safety positions upon the occurrence of. a leak in said thermosensitive tem.l

2 8. In acooling system for internal combustion engines, a radiator, means for controlling Vthe passage of air therethrough, a

valve for controlling the flow ofcooling medium through said radiator and having a position of safety, a pressure. motor for operating said air-controlling means, a sysfor circulating a fluid in operative. re-

lation tol said pressure motor, a valve in said system adapted in one position to cause said'pressure motor to move said alr-co'ntheir respective sa trolling means to safety position, a by-p'ass.-

around said radiator, a valve .for controlling the flow o f cooling medium through said bypass and having a position. of safety, and

thermosensitlve means' for loperating said valves, said thermosensitive meansv having an inherent tendene to move said'valves to ty positions `1'1p on-the .occurrence of 'a leak vin said thenno'sensitive 'mean`s. ,i

v29. In -afcooling system for internal com-' bustion engines, a radiator, means for controlling thel passage fof. air therethrough, a

valve for controlling'the-iow of cooling lne-.

dium through saidradiatOr, `a' piston. forA operating said air-controlling mea'ns',al sysfluid 'in operative 'ref-j valve in' said'system'YV tem for circulatingf'a lationto` said piston, aA for regulating the degree of pressuretransating `means for said jvalves-` 30. In acooling system for internal'com-f iator, meansfor con-"fj auxlliar bustion engines, a rad p trolling thepassageof air. therethrough',iba

by-pass around f said radiator, valve `mechaf the flow ofcooling .radiatorand hyass, mg

nism for controllin medium through sai t a pistonforoperatin'gsald air-contro means, a'system 'forcirculatingfa fluid in means for saidvalves.

31. Ina cooling system for internal com- V a pressure motor for opercommon actuating means medium thermosensitive means' valvev mechanism,

l to said piston, and a:

bustion engines, a radiator, means vfor controlling the passage of air therethrough, a by-pass around said radiator, v alve mechanism for controlling the flow o-cooling medium through said radiator and ley-pass, a pressure motor for operating said aircontrolling means, a system for conveying a pressure-fluid to said1 pressure motor, a valve in said system for controlling the pressure transmitted to said pressure motor, and a'common actuating means for said valves. f

32. In a coolingA system for internal combustion engines, a radiator, means for controlling rthe passage of air therethrough, a by-pass around saidl radiator, valve-mechauism for controlling the flow' of cooling medium'through said radiator' and by-pass, a

transmitted to said pressure motor, and

Athermosensitive .meansfor actuating' said valves.L v 33.[In a cooling system -for'internal cornbustion engines, a radiator, means for controlling the` passa valve for control ing-the 'iiow 'of cooling medium through said radiator,

means, avalve for regulating the pressure transmitted to saidpressure motor, and afor said valves.

84.1n a cooling system for internal combustionengines, a radiator, means for con.-

trollin the passage of air therethrough, a

-valve or "controlling mean's,a valve for regulatingfthe 'pressure Valves.y i .35. In bnstion'eiiginea 4a radiator, means for controlling'; thej 'passage of vvalvefmechanismfor controlling the flow of fthe cooling medium through said.' system, --fthermosensitive means for operating said a pressure motor for oper` ating-sad air-controlling means, and -an system for circulating jing e .ium in operativ e relat1on ,to` said pressure motor, said auxlllar system hav- :nearly/@whereby there is circulation of said coolu/ig vmedium past said thermosensitive means' at all times.

In testimonywliereofllliave signed this specification. 1"; i

JEAN v.. GiEsLa- I a pressureA moto r for operating said alr-controllmg '95 for i actuating alcocling system `for 'internal i.

ain therethrough, f

inletgadjacent saidt ermosensitive '120 of air therethrough, a i

the flow of cooling through said radiatoig'ra pressure' m otor v for voperating said air-'controlling 

